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A narrowband terahertz signal generated by a unitravelling carrier (UTC-PD) interfaced with a dual-mode Fabry-Pérot laser is demonstrated. A beat tone corresponding to the free spectral is generated on the UTC-PD, and radiated by a-electromagnetic-horn antenna. A terahertz signal at a of 372 GHz, featuring a linewidth of 17 MHz is recorded by a mixer coupled to an electrical spectrum analyzer. All involved in this experiment operate at room temperature. The and the frequency of the emitted terahertz wave are analyzed, with their dependency on dc-bias conditions applied to laser.
Flacke et al. (Sat,) studied this question.